WO2016203732A1 - ヘッドアップディスプレイ装置 - Google Patents
ヘッドアップディスプレイ装置 Download PDFInfo
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- WO2016203732A1 WO2016203732A1 PCT/JP2016/002742 JP2016002742W WO2016203732A1 WO 2016203732 A1 WO2016203732 A1 WO 2016203732A1 JP 2016002742 W JP2016002742 W JP 2016002742W WO 2016203732 A1 WO2016203732 A1 WO 2016203732A1
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- Prior art keywords
- image
- light
- reflectance
- projector
- head
- Prior art date
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Images
Classifications
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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- G02B27/0101—Head-up displays characterised by optical features
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- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
- B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
- B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
- B60K35/23—Head-up displays [HUD]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- B60K35/60—Instruments characterised by their location or relative disposition in or on vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
- G02B2027/012—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility comprising devices for attenuating parasitic image effects
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- G02B2027/0196—Supplementary details having transparent supporting structure for display mounting, e.g. to a window or a windshield
Definitions
- the present disclosure relates to a head-up display device (hereinafter, abbreviated as a HUD device) that is mounted on a vehicle and displays a virtual image so that the image can be viewed by an occupant.
- a head-up display device hereinafter, abbreviated as a HUD device
- a HUD device that is mounted on a vehicle and displays a virtual image so that an image can be visually recognized by a passenger is known.
- the HUD device disclosed in Patent Literature 1 projects an image onto a projection member positioned above the vehicle from the instrument panel.
- a projector that projects an image as light polarized in a predetermined polarization direction, and a reflecting mirror that reflects the light of the image from the projector side to the projection member side by reflection on an optical path between the projector and the projection member; It has.
- the reflecting mirror is formed by sticking a polarizing film on one side surface of a translucent plate-like substrate.
- the reflection axis is set in accordance with the polarization axis of the projector, and is set to form an angle of 45 ° with respect to the horizontal direction of the image.
- the inventors have further studied the nature of the external light.
- the external light that passes through the projection member and enters the HUD device passes through the projection member, and corresponds to the vertical direction of the image. It was found that partial polarization along the line is likely to occur. That is, by configuring the HUD device in consideration of the partial polarization, it has been found that there is a possibility that external light is efficiently cut and temperature rise of the projector is suppressed.
- This indication aims at providing the HUD device which can control the temperature rise of a projector.
- a head-up display device is mounted on an instrument panel of a vehicle, and the image is visually recognized by an occupant by projecting the image onto a projection member positioned above the instrument panel. If the direction along the vertical direction of the vehicle is defined as the vertical direction of the image when the virtual image is displayed, the image is displayed as light polarized in a polarization direction that intersects the vertical direction of the image. And a reflecting mirror for reflecting the light of the image from the projector side back to the projection member side by reflection on the optical path between the projector and the projection member, and for the light from the projector And a reflecting mirror having different S-polarized light reflectance and P-polarized light reflectance.
- image light is incident on the reflecting mirror on the optical path between the projector and the projection member from the projector side, and external light is transmitted through the projection member and enters the HUD device.
- the external light is partially polarized along the direction corresponding to the vertical direction of the image
- the external light and the light of the image polarized in the polarization direction intersecting the vertical direction of the image are polarized in different directions. It will be a thing.
- the reflecting mirror has different S-polarized light reflectance and P-polarized light reflectance, projection of external light is performed while improving the reflectance of the image light to the projection member side according to the folding direction of the reflecting mirror. It becomes possible to reduce the reflectance to the container side.
- the HUD apparatus which suppresses the temperature rise of a projector can be provided by cutting external light efficiently.
- FIG. 1st Embodiment It is a schematic diagram which shows the mounting state to the vehicle of the HUD apparatus in 1st Embodiment. It is a schematic diagram which shows the optical path of the HUD apparatus in 1st Embodiment. It is a perspective view which shows the structure of the projector in 1st Embodiment. It is a schematic diagram which shows the case where the optical path of FIG. 2 is seen from the vehicle upper part to the vehicle lower part. It is a schematic diagram which expands and shows the submirror in 1st Embodiment. It is a schematic diagram which shows the optical path of the HUD apparatus in 2nd Embodiment.
- FIG. 5 It is a schematic diagram which shows the case where the optical path of FIG. 5 is seen from the vehicle left side to the vehicle right side. It is a schematic diagram which expands and shows the submirror in 2nd Embodiment. It is a figure corresponding to FIG. 7 in 3rd Embodiment.
- the HUD device 100 As shown in FIG. 1, the HUD device 100 according to the first embodiment of the present disclosure is mounted on a vehicle 1 and is accommodated in an accommodation space 2 a in an instrument panel 2.
- the HUD device 100 projects an image on a windshield 3 as a projection member of the vehicle 1.
- the HUD device 100 displays a virtual image so that the image can be visually recognized by the passenger of the vehicle 1. That is, the light of the image reflected by the windshield 3 reaches the eye point EP of the occupant in the vehicle 1 and the occupant perceives the light of the image as a virtual image VI.
- a crew member can recognize various information by virtual image VI. Examples of various types of information displayed as virtual images include vehicle state values such as vehicle speed and fuel remaining amount, or navigation information such as road information and visibility assistance information.
- the windshield 3 of the vehicle 1 is located above the instrument panel 2 in the upper UD of the vehicle, and is formed in a translucent plate shape with glass or synthetic resin. Further, the windshield 3 is disposed so as to be inclined toward the vehicle rear BD toward the vehicle upper UD. In the windshield 3, the surface on the indoor side has a concave or flat projection surface 3 a on which an image is projected. It is formed in a flat shape.
- an occupant seated on the seat 4 of the vehicle 1 and facing the front FD of the vehicle 1 can visually recognize the foreground including the road and the road sign through the windshield 3 and can also visually recognize the virtual image display of the image.
- the accommodation space 2a in the instrument panel 2 has a dimension in the vehicle left-right direction larger than the dimension in the vehicle vertical direction. Therefore, the optical system of the HUD device 100 is designed according to the accommodation space 2a.
- the vehicle lower direction DD indicates a direction in which gravity is generated when the vehicle 1 travels on a flat ground or stops on a flat ground.
- the vehicle upper UD indicates the direction opposite to the vehicle lower DD.
- the vehicle front FD indicates a direction in which an occupant seated in the seat 4 faces the front.
- the vehicle rear BD indicates a direction opposite to the vehicle front FD.
- the vehicle left side LD indicates a left direction as viewed from the occupant facing the vehicle front FD.
- the vehicle right side RD indicates a right direction viewed from the occupant facing the vehicle front FD.
- the vehicle vertical direction indicates the vehicle upper UD and the vehicle lower DD.
- the vehicle front-rear direction indicates a vehicle front FD and a vehicle rear BD.
- the vehicle left-right direction refers to a vehicle left side LD and a vehicle right side RD.
- the direction along the vehicle vertical direction when the image is displayed as a virtual image is defined as the vertical direction VD of the image
- the direction along the vehicle horizontal direction when the image is displayed as a virtual image is defined as the horizontal direction HD of the image.
- the HUD device 100 includes a projector 10, a secondary mirror 30, and a concave mirror 40, which are accommodated in a housing having a shape corresponding to the accommodation space 2a.
- the projector 10 includes a light source 12, a condenser lens 14, a diffuser plate 16, a projection lens 18, and a liquid crystal panel 20.
- the projector 10 is formed by housing them in a box-shaped projector case. Has been.
- the light source 12 is a plurality of light emitting diode elements, for example, and is disposed on the light source circuit board 12a.
- the light source 12 is electrically connected to a power source through a wiring pattern on the light source circuit board 12a.
- the light source 12 emits light source light with a light emission amount corresponding to a current amount when energized. Thereby, the light source 12 projects the light source light toward the condenser lens 14. More specifically, the light source 12 realizes pseudo white light emission by covering a blue light emitting diode with a phosphor, for example.
- the condenser lens 14 is a translucent convex lens made of synthetic resin or glass, and is disposed between the light source 12 and the diffusion plate 16.
- the condenser lens 14 condenses the light source light from the light source and emits it toward the diffusion plate 16.
- the diffusion plate 16 is a plate formed of synthetic resin or glass, and is disposed between the condenser lens 14 and the projection lens 18.
- the diffusing plate 16 emits light source light whose luminance uniformity is adjusted by diffusion toward the projection lens 18.
- the projection lens 18 is a translucent convex lens made of synthetic resin or glass, and is disposed between the diffusion plate 16 and the liquid crystal panel 20.
- the projection lens 18 condenses the light source light from the diffusion plate 16 and projects it toward the liquid crystal panel 20.
- the liquid crystal panel 20 is a liquid crystal panel using, for example, a thin film transistor (TFT), and is an active matrix formed from a plurality of liquid crystal pixels arranged in a two-dimensional direction of a vertical direction VD and a horizontal direction HD of an image.
- Type liquid crystal panel In the liquid crystal panel 20, a pair of polarizing plates and a liquid crystal layer sandwiched between the pair of polarizing plates are stacked.
- the polarizing plate has the property that the electric field vector transmits light in a predetermined direction and the electric field vector blocks light in a direction substantially perpendicular to the predetermined direction, and the pair of polarizing plates are arranged so that the predetermined directions are substantially orthogonal to each other. Is done.
- the liquid crystal layer can rotate the polarization direction of light incident on the liquid crystal layer in accordance with the applied voltage by applying a voltage for each liquid crystal pixel.
- the projector 10 can project an image.
- the image projected from the projector 10 is projected as light polarized in the polarization direction PD intersecting the vertical direction VD of the image due to the arrangement of the polarizing plates.
- the polarization direction PD is a direction that forms an angle of 45 ° or more with respect to the vertical direction VD of the image.
- the polarization direction PD is a direction substantially parallel to the horizontal direction HD of the image.
- the liquid crystal panel 20 of the present embodiment is a horizontally long panel that is formed in a rectangular shape and has a horizontal dimension HD of an image larger than a vertical dimension VD.
- the light of the image from the projector 10 constitutes an optical path OP through the secondary mirror 30, the concave mirror 40, and the windshield 3 as shown in FIGS.
- the optical path OP1 from the projector 10 to the secondary mirror 30 is configured along the vehicle left-right direction
- the optical path OP2 from the secondary mirror 30 to the concave mirror 40 is along the vehicle longitudinal direction
- the optical path OP3 from the concave mirror 40 to the windshield 3 is configured along the vehicle vertical direction.
- the secondary mirror 30 disposed on the optical path OP has a phase difference plate 32 and a dielectric multilayer film 34, and these are stacked to form a flat plate shape.
- the phase difference plate 32 is a phase plate formed in a plate shape by, for example, sapphire glass or polycarbonate resin.
- the phase difference plate 32 is disposed on the front side of the sub mirror 30, that is, on the light incident / reflection side of the image.
- the dielectric multilayer film 34 is disposed on the back side of the phase difference plate 32, and is formed by laminating two or more types of thin films made of dielectric materials having different refractive indexes in the normal direction ND of the front side surface 30a.
- the dielectric multilayer film in this embodiment is a 10-layer multilayer film including a dielectric film made of, for example, silicon dioxide (SiO 2 ) or titanium dioxide (TiO 2 ).
- Each film thickness in each dielectric film is appropriately set by, for example, calculation by a computer in order to obtain reflection characteristics such that the infrared light reflectance is lower than the visible light reflectance. Note that this reflection characteristic does not necessarily have to be established for all wavelengths of infrared light and visible light, and the average reflectance for each wavelength of infrared light is the reflectance of each wavelength of visible light. It is sufficient if it is lower than the average value.
- the secondary mirror 30 is formed by depositing a dielectric multilayer film on the surface of the phase difference plate 32.
- the secondary mirror 30 is a reflecting mirror that returns the image light from the projector 10 side to the concave mirror 40 on the windshield 3 side by reflection.
- the light of the image is folded along the horizontal direction HD of the image.
- the vertical direction VD and horizontal direction HD of the image when the image is displayed as a virtual image, or the vertical direction VD and horizontal direction HD of the image on the liquid crystal panel 20 of the projector 10 are used as vectors.
- Projection is performed to the secondary mirror 30 along the optical path OP.
- these vectors projected on the front side surface 30a of the secondary mirror 30 are compared with the folded projection line PL (see FIG. 2) obtained by orthogonally projecting the optical path OP of the incident light and reflected light on the secondary mirror 30 onto the front side surface 30a.
- the secondary mirror 30 transmits the light of the image in the horizontal direction of the image. It can be said that it is folded along the direction HD.
- the phase difference of the phase difference plate 32 is set so as to be generated for one-way 1 ⁇ 2 wavelength with respect to the image light incident and reflected obliquely (for example, at an incident angle of 45 °).
- the fast axis direction of the phase difference plate 32 is set in an oblique direction with respect to the vertical direction VD and horizontal direction HD of the incident image, for example, at an angle of 45 ° with respect to the vertical direction VD and horizontal direction HD of the image.
- the secondary mirror has different S-polarized reflectance and P-polarized reflectance with respect to image light, and the P-polarized reflectance is higher than the S-polarized reflectance.
- the difference between the S-polarized reflectance and the P-polarized reflectance is 5% or more.
- the concave mirror 40 disposed on the optical path OP is formed by depositing aluminum as a reflective surface 40a on the surface of a base material made of synthetic resin or glass as shown in FIGS.
- the reflective surface 40a is formed in a smooth curved surface as a concave surface in which the center of the concave mirror 40 is recessed. Then, the concave mirror 40 reflects the light of the image from the secondary mirror 30 back to the windshield 3 along the vertical direction VD of the image.
- the image light from the projector 10 is incident on the phase difference plate 32 of the secondary mirror 30 obliquely as P-polarized light.
- the image light transmitted through the phase difference plate 32 is converted into S-polarized light when reaching the interface 30b with the dielectric multilayer film 34 by the action REA of the phase difference plate 32.
- the dielectric multilayer film 34 has an S-polarized reflectance higher than the P-polarized reflectance, the image light is reflected with a high reflectance.
- the image light reflected by the dielectric multilayer film 34 passes through the phase difference plate 32 again, but is converted to P-polarized light by the action REB of the phase difference plate 32 and travels toward the concave mirror 40.
- external light such as sunlight may enter the HUD device 100 as shown in FIGS.
- the S-polarized reflectance of the windshield 3 is higher than the P-polarized reflectance, and thus the partially polarized light with a large P-polarized component with respect to the windshield 3 is obtained.
- the image projected onto the vehicle upper UD from the instrument panel 2 is used as a reference, and the external light becomes partial polarization along the direction corresponding to the vertical direction VD of the image, and the optical path Reverse OP3.
- the incident direction of the windshield 3 changes depending on the direction of the vehicle 1 and the time and the like, but the outside light incident on the HUD device 100 is somewhat Even if there is a direction error, such partial polarization is obtained.
- the external light reflected by the concave mirror 40 is incident on the phase difference plate 32 of the secondary mirror 30 obliquely with a large amount of S-polarized light component with respect to the secondary mirror 30.
- the image light transmitted through the phase difference plate 32 reaches the interface 30b with the dielectric multilayer film 34 due to the action REC of the phase difference plate 32, the P light component becomes large.
- the dielectric multilayer film 34 has an S-polarized reflectance higher than that of the P-polarized reflectance, the image light is transmitted with a high transmittance. In this way, most of the outside light is separated from the optical path OP.
- FIGS. 2 and 5 the polarization state of the image light and the polarization state of the external light are schematically shown by arrows. However, for external light, partial polarization is omitted in the figure and indicates a direction with many components.
- image light is incident on the secondary mirror 30 as the reflecting mirror on the optical path OP between the projector 10 and the windshield 3 as the projection member from the projector 10 side, and the window External light may enter the HUD device 100 through the shield 3.
- the external light is partially polarized along a direction corresponding to the vertical direction VD of the image
- the external light and the light of the image polarized in the polarization direction PD intersecting the vertical direction VD of the image are different directions. Polarized light.
- the S-polarized light reflectance and the P-polarized light reflectance of the secondary mirror 30 are different from each other, the reflectance of the image light toward the windshield 3 is improved according to the folding direction of the secondary mirror 30, and the external mirror 30 It becomes possible to reduce the reflectance of light to the projector 10 side. As described above, it is possible to provide the HUD device 100 that suppresses the temperature rise of the projector 10 by efficiently cutting outside light.
- the secondary mirror 30 folds the light of the image along the horizontal direction HD of the image, and the P-polarized reflectance is higher than the S-polarized reflectance.
- the reflectance of the light of the image polarized in the polarization direction PD intersecting with the vertical direction VD of the image is surely improved to the windshield 3 side, and the vertical direction VD of the image is supported. It is possible to reduce the reflectance of the external light to the projector 10 side that tends to be partially polarized along the direction.
- the secondary mirror 30 includes the phase difference plate 32 disposed on the front side of the secondary mirror 30 and the dielectric multilayer film 34 disposed on the back side of the phase difference plate 32.
- the phase difference plate 32 can change the polarization of the incident light so that the incident light can be incident on the dielectric multilayer film 34, so that the reflectance in the dielectric multilayer film 34 is controlled. It becomes possible. Therefore, the P-polarized reflectance can be easily made higher than the S-polarized reflectance, and external light can be cut efficiently.
- the dielectric multilayer film 34 has a reflection characteristic in which the infrared light reflectance is lower than the visible light reflectance. According to this, the light of the image is reflected to the windshield 3 side with high reflectivity as visible light, and the reflection of infrared light to the projector 10 side of the external light causing heat is suppressed. Therefore, the temperature rise of the projector 10 can be suppressed.
- the difference between the S-polarized reflectance and the P-polarized reflectance is 5% or more.
- the polarization direction PD is a direction that forms an angle of 45 ° or more with respect to the vertical direction VD of the image.
- the second embodiment of the present disclosure is a modification of the first embodiment.
- the second embodiment will be described with a focus on differences from the first embodiment.
- the HUD device 200 of the second embodiment is accommodated in an accommodation space 202 a in the instrument panel 2 of the vehicle 1 as in the first embodiment.
- the storage space 202a has a dimension in the vehicle vertical direction larger than that in the vehicle horizontal direction. Therefore, the optical system of the HUD device 200 is designed according to the accommodation space 202a.
- the light of the image from the projector 10 constitutes an optical path OP through the secondary mirror 230, the concave mirror 40 and the windshield 3.
- the optical path OP1 from the projector 10 to the secondary mirror 230 is configured along the vehicle vertical direction
- the optical path OP2 from the secondary mirror 230 to the concave mirror 40 is along the vehicle longitudinal direction. It is configured.
- the optical path OP3 from the concave mirror 40 to the windshield 3 is configured along the vehicle vertical direction.
- the secondary mirror 30 of the second embodiment includes a light transmitting plate 236 and a dielectric multilayer film 234, which are stacked to form a flat plate shape.
- the dielectric multilayer film 234 is disposed on the front side of the sub mirror 30, that is, on the incident side of the image light from the projector 10. Since the other configuration of the dielectric multilayer film 234 is the same as that of the dielectric multilayer film 34 of the first embodiment, the description thereof is omitted.
- the translucent plate 236 is disposed on the back side of the dielectric multilayer film 234 and is formed in a flat plate shape with synthetic resin or glass.
- the secondary mirror is formed by vapor-depositing the dielectric multilayer film 234 on the surface of the translucent plate 236.
- the secondary mirror 230 Due to such a dielectric multilayer film 234, the secondary mirror 230 has different S-polarized reflectance and P-polarized reflectance with respect to image light, and the S-polarized reflectance is higher than the P-polarized reflectance. It is high. In particular, in this embodiment, the difference between the S-polarized reflectance and the P-polarized reflectance is 5% or more.
- the secondary mirror 230 is a reflecting mirror that returns the image light from the projector 10 side to the concave mirror 40 on the windshield 3 side by reflection. In the secondary mirror 230 of the second embodiment, the light of the image is folded along the vertical direction VD of the image.
- the image light from the projector 10 is incident on the dielectric multilayer film 234 of the secondary mirror 230 obliquely as S-polarized light.
- the dielectric multilayer film 234 of the secondary mirror 230 has an S-polarized reflectance higher than the P-polarized reflectance, the image light is reflected with a high reflectance. And it goes to the concave mirror 40.
- the secondary mirror 30 when external light such as sunlight enters the HUD device 200 and is reflected by the concave mirror 40, the secondary mirror 30 has a large amount of P-polarized light component and is obliquely applied to the dielectric multilayer film 234 of the secondary mirror 230. Is incident on.
- the dielectric multilayer film 234 of the secondary mirror 230 since the dielectric multilayer film 234 of the secondary mirror 230 has an S-polarized reflectance higher than the P-polarized reflectance, external light passes through the dielectric multilayer film 234 with a high transmittance, Further, the light passes through the translucent plate 236. In this way, most of the outside light is separated from the optical path OP.
- the secondary mirror 230 as a reflecting mirror folds the image light along the vertical direction VD of the image, and the S-polarized reflectance is higher than the P-polarized reflectance. Therefore, the portion along the direction corresponding to the vertical direction VD of the image is reliably improved while improving the reflectance of the light of the image polarized in the polarization direction PD intersecting the vertical direction VD of the image to the windshield 3 side.
- the reflectance of the external light that tends to be polarized light toward the projector 10 can be reduced.
- the secondary mirror 230 has the dielectric multilayer film 234 in which dielectrics are stacked along the normal direction ND of the front side surface 230a. Since the dielectrics are stacked along the normal direction ND of the front side surface 230a, even if the secondary mirror 30 is rotated around the normal direction ND at the time of manufacture, for example, the S-polarized light reflectance Is maintained higher than the P-polarized light reflectance, so that external light can be efficiently cut. Therefore, since it is not necessary to consider the rotation tolerance of the secondary mirror 30 at the time of manufacture, the HUD device 200 that suppresses the temperature rise of the projector 10 can be easily provided.
- the third embodiment of the present disclosure is a modification of the second embodiment.
- the third embodiment will be described with a focus on differences from the first embodiment.
- the secondary mirror 330 in the HUD device 300 of the third embodiment includes a light transmitting plate 336 and a dielectric multilayer film 334, but unlike the second embodiment, has a convex mirror shape. Is formed.
- the translucent plate 336 is formed in a curved plate shape whose center on the front side is convex, and the sub-mirror 330 is formed by vapor-depositing the dielectric multilayer film 334 on the front side. Since the dielectric multilayer film 334 is the same as the dielectric multilayer film 34 of the first embodiment except that the dielectric multilayer film 334 is laminated according to the curved surface, the description thereof is omitted.
- the secondary mirror 330 as a reflecting mirror is formed in a convex mirror shape. According to the secondary mirror 330, even if a part of the external light is reflected by the secondary mirror 330, the secondary mirror 330 spreads in the other direction, so that the arrival rate at the projector 10 can be further suppressed. The temperature increase of 10 can be suppressed.
- optical elements such as lenses and mirrors may be additionally arranged on the optical path OP.
- a combiner separate from the vehicle may be installed in the vehicle, and an image may be projected onto the combiner.
- the secondary mirror 30 may have a translucent plate disposed on the back side of the dielectric multilayer film 34, for example, to ensure strength.
- the concave mirror 40 that reflects the light of the image from the projector 10 side to the windshield 3 along the vertical direction VD of the image is reflected, and the S polarization reflectance is P polarization reflection. You may make it the structure used as the reflecting mirror higher than a rate. In this case, a secondary mirror may not be provided separately.
- the alignment direction of the liquid crystal elements of the projector 10 may not correspond to the vertical direction VD and the horizontal direction HD of the image. That is, the oblique direction with respect to the arrangement direction of the liquid crystal elements of the projector 10 may correspond to the vertical direction VD or the horizontal direction HD of the image.
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Abstract
Description
図1に示すように、本開示の第1実施形態によるHUD装置100は、車両1に搭載され、インストルメントパネル2内の収容スペース2aに収容されている。HUD装置100は、車両1の投影部材としてのウインドシールド3に画像を投影する。画像の光がウインドシールド3に反射されることで、HUD装置100は、画像を車両1の乗員により視認可能に虚像表示する。すなわち、ウインドシールド3に反射される画像の光が、車両1の室内において乗員のアイポイントEPに到達し、当該乗員が当該画像の光を虚像VIとして知覚する。そして、乗員は、虚像VIにより各種情報を認識することができる。画像として虚像表示される各種情報としては、例えば、車速、燃料残量等の車両状態値、又は、道路情報、視界補助情報等のナビゲーション情報が挙げられる。
以上説明した第1実施形態の作用効果を以下に説明する。
図6~8に示すように、本開示の第2実施形態は第1実施形態の変形例である。第2実施形態について、第1実施形態とは異なる点を中心に説明する。
図9に示すように、本開示の第3実施形態は第2実施形態の変形例である。第3実施形態について、第1実施形態とは異なる点を中心に説明する。
以上、本開示の複数の実施形態について説明したが、本開示は、それらの実施形態に限定して解釈されるものではなく、本開示の要旨を逸脱しない範囲内において種々の実施形態及び組み合わせに適用することができる。
Claims (9)
- 車両(1)のインストルメントパネル(2)に搭載され、前記インストルメントパネルよりも車両上方(UD)に位置する投影部材(3)に、画像を投影することにより、前記画像を乗員により視認可能に虚像表示するヘッドアップディスプレイ装置であって、
前記画像が虚像表示されるときに前記車両の上下方向に沿う方向を、前記画像の縦方向(VD)と定義すると、
前記画像の縦方向とは交差する偏光方向(PD)に偏光する光として前記画像を投射する投射器(10)と、
前記投射器と前記投影部材との間の光路(OP)上において、前記投射器側からの前記画像の光を反射により前記投影部材側へ折返す反射鏡であって、前記投射器からの光に対して、S偏光反射率とP偏光反射率とが異なる反射鏡(30,230,330)と、を備えるヘッドアップディスプレイ装置。 - 前記画像が虚像表示されるときに前記車両の左右方向に沿う方向を、前記画像の横方向(HD)と定義すると、
前記反射鏡(30)は、前記画像の光を前記画像の横方向に沿って折返し、前記P偏光反射率が前記S偏光反射率よりも高い請求項1に記載のヘッドアップディスプレイ装置。 - 前記反射鏡は、
前記反射鏡の表側に配置される位相差板(32)と、
前記位相差板よりも裏側に配置される誘電体多層膜(34)と、を有する請求項2に記載のヘッドアップディスプレイ装置。 - 前記反射鏡(230)は、前記画像の光を前記画像の縦方向に沿って折返し、前記S偏光反射率が前記P偏光反射率よりも高い請求項1に記載のヘッドアップディスプレイ装置。
- 前記反射鏡は、表側面(230a)の法線方向(ND)に沿って誘電体が積層される誘電体多層膜(234)を有する請求項4に記載のヘッドアップディスプレイ装置。
- 前記誘電体多層膜は、赤外光反射率が可視光反射率よりも低い反射特性を有する請求項3又は5に記載のヘッドアップディスプレイ装置。
- 前記反射鏡(330)は、凸面鏡状である請求項1から6のいずれか1項に記載のヘッドアップディスプレイ装置。
- 前記S偏光反射率と前記P偏光反射率との差は、5%以上である請求項1から7のいずれか1項に記載のヘッドアップディスプレイ装置。
- 前記偏光方向は、前記画像の縦方向に対して45°以上の角度をなす方向である請求項1から8のいずれか1項に記載のヘッドアップディスプレイ装置。
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KR1020177033797A KR101956497B1 (ko) | 2015-06-17 | 2016-06-07 | 헤드업 디스플레이 장치 |
US15/576,870 US10437056B2 (en) | 2015-06-17 | 2016-06-07 | Head-up display device having reflecting mirror with different P and S polarization reflectances |
DE112016002740.0T DE112016002740T5 (de) | 2015-06-17 | 2016-06-07 | Head-up-Display-Vorrichtung |
CN201680034550.2A CN107683433B (zh) | 2015-06-17 | 2016-06-07 | 平视显示装置 |
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JP (1) | JP6451523B2 (ja) |
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KR101956497B1 (ko) | 2019-03-08 |
CN107683433B (zh) | 2020-07-17 |
US20180164585A1 (en) | 2018-06-14 |
CN107683433A (zh) | 2018-02-09 |
JP6451523B2 (ja) | 2019-01-16 |
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US10437056B2 (en) | 2019-10-08 |
JP2017009666A (ja) | 2017-01-12 |
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